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Russian Lady's watch w/ perpetual calendar

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Andrew Babanin

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Russian Lady's watch w/ perpetual calendar

Post18 Jan 2016, 23:21

There's a quite rare watch, based on the experimental module, with diameter 26 mm, looks a bit common to 2651 - mass LED module, produced in USSR, but with no two buttons. Three other buttons are on their own places. When you choose the month the one more digit is displayed before months - from 0 to 3 - means years with leap year.

I compared it with mass gold plated Elektronika 1, produced in November 1976:

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display allows to show letters (9 elements instead of common 7)

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Compared with Gents wodel, based on 3051 module

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The pics of module:
there are no inscriptions and serials - ceramic plate is foxed on the plastic base. According to cylindric quartz popular in USSR in the mid of 80-s I can suppose that this watch from the mid of 80s.

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Here's a pic of ordinary ceramic 2651

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Kasper

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Re: Russian Lady's watch w/ perpetual calendar

Post20 Jan 2016, 12:10

wow...nice. Never seen before.

Great shot btw.
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dutchsiberia

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Re: Russian Lady's watch w/ perpetual calendar

Post29 Jan 2016, 15:53

I agree, great pictures of again a super rare watch, you've got very interesting stuff :-D
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Re: Russian Lady's watch w/ perpetual calendar

Post07 Dec 2017, 07:48

I found a few very interesting details about this watch. This module had to be called as B6-302, and it was mentioned in technical literature in August 1978. The main thing of this chip - is digital correction of accuracy. It very common to Synchronar system - the same range of correction - 0-799 but only 23 points (not 46 for Ragen) to correct 1 second per day. Later i found instruction for pen watch Elektronika 1. It is mentioned, how to adjust perpetual calendar for December 1977. So I guess, the chip produced in the beginning (mid) of 1977. The normal russian Elektronika has a chip with frequency divisor dor 512 and 256 Hz, decoder and controller. For digits there were two assemblies with transistors - one with 7 ones - for segments and one for 4 ones - for digits. Information is sent in 4 cycles. This chip has only 4 transistors in assembly in key mode.
Very interestiog point that there was Qualitron watch pen in the box.
Here it is

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Here i put scans of instruction for watch pen in russian with digital correction and perpetual calendar an days of week

http://www.horology.ru/TZ/ele416.jpg
http://www.horology.ru/TZ/ele417.jpg

Very interesting when Ragen started digital correction of accuracy.
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Andrew Babanin

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Re: Russian Lady's watch w/ perpetual calendar

Post07 Dec 2017, 08:01

here a fer macros of usual chip and assemblies for russian led watch

A chip, with 1979 mark

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two assemblies for four, seven transistors, also assembly of 3 resistors

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Andrew Babanin

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Re: Russian Lady's watch w/ perpetual calendar

Post07 Dec 2017, 08:11

Also I found two cases for module B6-302, I dated them as mid of 80s, not earlier than 1984, so these modules with this chip could be under production at least for 7 years . Unfortunately I have got the only known module B6-302, so it is tricky to analyse it.

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Re: Russian Lady's watch w/ perpetual calendar

Post13 Dec 2017, 20:15

interesting read..thx Andrew
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