New to me, First Martini

[BVZ24]

It's a nice, highly original example of a Martini 303, in poor condition. It's been sold out of service, and has some sort of rack number.
Currently I have the screws soaking in renchaid, a vintage rust remover I can't get more of, that loosens up anything. For emergencies only.
The screws still do not budge.


https://ibb.co/s6CJD0T
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https://ibb.co/J2jP9yr