Manual gear shifting problem

Thanks Joe for your reply.

I need to find a free day to deal with that problem.
So, now, I am collecting information, what could be the problem, what to check and how to check, before I will start to deal with it.
If this will be the issue and I will find something loose or disconnected, should I need to buy replacement or I can connect it back, lubricate it or something?
BTW, I attached a photo of the car's selector linkage. Is this what you are talking about?

I really hope that this will be the case.
Thanks, Joe.

Today, I started to search the issue.I was hopping to find the shifter rod (number 9 at photo)
comes off/disconnected, but it wasn't. So I didn't know really what to look for.I didn't see anything disconnected.
So I play with the selector while I am under the hood. The selector mechanism seems to be loose, but I don't know how much is considered to be too loose. Under the hood, I grasped and moved the mechanism, I managed to shift the selector to 3, 4 and 5 gears (while in driving I can shift only 3 and 4 but not 5).1, 2 and reverse I couldn't shift under the car hood, maybe if I give more power and someone was press the clutch pedal I could shift them, so I don't really know if it can be shift or not to those gears by hand). Besides that the 3 and 4 gears were always shift smoothly compare to the 1 and 2, so maybe there is a connection between my results. Anyway, while in driving, I can use 1 gear and 2 gear, but in the special conditions that I mentioned before and while I don't have a reverse.
What should I do next?

Hi Joe.

Yes, I checked the linkage and I didn't see anything disconnected, but there was a play in the mechanism of the linkage.I did a lot of different tasks in that old car, but this is the first time that I works with that shift linkage part in the car, so I don't have something to compare in order to determine if the mechanism play is considered to be reasonable.
What should be the maximum shift linkage play before it start to act like in my case?What should I look for?
I couldn't see the linkage movements while someone shift to reverse, since I didn't have any assistance, but I can mentions those points:
*While I am driving, shifting the gearshift lever to reverse gives me 1 gear, so I assume that the linkage moves into 1 gear.
*2 gear I can shift only from 1 gear.
*when I am driving I can shift to 3 and 4 smoothly.
*when I move the gearshift lever to 5 gear, it feels like it was shifted to 5 gear, but light touch on the lever revealed that the lever is actually on 3 gear and there is a playing between 3 and five positions of the shift gear lever.

Hi Joe.
As you see my gearshift lever looks like my attached photo,
In your attached photo is different.
I attached a video that shows the behavior of the linkage when I use the gearshift lever. The subtitles that I added refers to the position of the gearshift lever in the car, while you can see what happens in the linkage.I know that you can't actually see all the linkage, but only the end of it, but that what I could to record, I hope it may tell something. BTW, I tries to do an adjustment to the gear followed by Haynes book, but nothing get better.
Refer to my attached photo of the gearshift lever, what is the purpose of the bush and the ring(number 23+24)?Can they cause the same symptoms
if one of them fails?

Hi Joe.

The video was recorded after my adjustment, but before I took the car for a test. So today I found out that the 5 gear is working.
That is why you may see in
the video that it shifted into the 5 gear. But the reverse is still missing.
Yes, the video shows what you said and if you say that this play in the universal joint is not normal, I guess that the other connection are not in better condition refer to their free play.I probably need a new gearshift
linkage indeed. The problem is that after hours of searching for the one that fit my car in eBay and in other websites I haven't find it yet.I see only the gearshift control rod for sell(number 9)for my car, but not as a complete unit.
When you said:". Something up further towards the passenger compartment."What other parts may cause or contribute to this?
Does the ring or the bush(23+24)may contribute to that?

I just would like to add refer to your video observation, that it happens on 2+4 gear and 1+3 gear (not 1+4), which I assume that you meant for that.

Hi Joe.
If you referred to the gear shift lever gaiter(boot)? If so yes I removed the gaiter, but in order to check the bush, ring an all the linkage, I need to dismantle a lot of parts and from my bad experience it is not a good idea to dismantle things that has not been touched for about 30 years, unless it must be done. My purpose is to find the specific problem according to the symptoms
and avoid of dismantle unnecessary parts only for checking. I haven't checked if my local spare parts have it yet, I checked for now only in the web sites, but, anyway, I first need to be sure what is the fail part. Refer to the bush/ring. Does a worn bush/ring has the same symptoms of the failure gear shift linkage?

Hi Joe.

I understand the issue that you don't have this vehicle in the US and you don't have any information to compare. So I thanks for your trying to help in-spite that issue. Last thing to verify, when you mentioned the bushing, we are talking about part number 23 in the photo, right?Or you actually referred to something else in the gear shift lever (between 5-13)?

Hi Joe.

Thanks a lot for your help, I hope that I will solve that issue.
But for now I decide to leave it parking. Dismantled the gearshift lever and all that small parts is more complicate than the gear shift linkage and in this old car, when you dig to much things get worse. So I guess I leave it for a while until I figure-out what to do next.
Thanks again, Joe.