Writing

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hps
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Writing

#1 Post by hps » Fri Jan 26, 2018 5:15 am

Hi Can anyone tell me what the nr. 50 stands for on the inside of the case?
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GaryM
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Re: Writing

#2 Post by GaryM » Sat Jan 27, 2018 1:08 pm

If you get no answer here pop on over to the Vintage Gruen forum. They also have several nice threads on Alpina Gruen and their history in the Watches of the Guild forum.

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MikeTheWatchGuy
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Re: Writing

#3 Post by MikeTheWatchGuy » Sat Jan 27, 2018 2:53 pm

Can't be the years the case is guaranteed since it's 18K.... prefix to the case serial?

What's the caliber of the movement in the watch? I'm attaching a caliber 50 movement illustration.... 21 jewel extra precision movement.

Are there other parts in the watch that end with 50 in the serial?

I dunno but I'm willing to take some shots at it.
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Caliber 50 movement
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GaryM
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Re: Writing

#4 Post by GaryM » Sat Jan 27, 2018 3:26 pm

No need to take a shot at it. The Vintage Gruen forum has the entire Alpina Gruen catalog at your fingertips thanks to Bernd. Should be able to identify it in no time. :D

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MikeTheWatchGuy
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Re: Writing

#5 Post by MikeTheWatchGuy » Sat Jan 27, 2018 3:34 pm

Well then, by all means traipse on over to some place where the answer is willing to be posted. :|
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Barney Green
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Re: Writing

#6 Post by Barney Green » Sun Jan 28, 2018 3:26 am

I do not think that the answer is in the Alpina Gruen Catalog. Gruen Caliber 50 was introduced 1911, this watch is from about the first half of the 30s. I do not think that Caliber 50 was available for 20 years.
Also I have seen these 2 digit markings in other Alpina watches, so I believe this is something Alpina specific. It might be an internal case maker number, but this is highly speculative.
hps: (Peter?) Please post a picture of the movement. Just in case Mike is in the right track with caliber 50.
Which number can be read in the hammer head, 45, 46, 49, 19,...? I just can't 100% identify...

Barney

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MikeTheWatchGuy
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Re: Writing

#7 Post by MikeTheWatchGuy » Sun Jan 28, 2018 6:19 am

I'm thinking case serial number prefix. Would likely mark the factory if that's the case.
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Barney Green
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Re: Writing

#8 Post by Barney Green » Sun Jan 28, 2018 7:27 am

Having had a closer look into the Alpina Gruen catalog I think I may have solved the riddle. The cases have been available in different gold weight classes. 50g and 60g cases were good ones and I have often seen these two numbers in the golden cases.
Please weigh the case and I guess you will come to 50g with yours? Is it net gold weight or is it 50g total?

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MikeTheWatchGuy
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Re: Writing

#9 Post by MikeTheWatchGuy » Sun Jan 28, 2018 7:30 am

Guess 'Guaranteed years' was my closest guess even though that's not at all the right term for solid gold. I guess solid would be more like 10,000 years.
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hps
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Re: Writing

#10 Post by hps » Sun Jan 28, 2018 8:08 am

Here is a picture
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