1942 Coated Summitar Info help

[PAN F]

A very interesting war-time Summitar.Serial No.585762 uncoated, delivered to Japanese Embassy in Berlin on the 15th December 1944.
I bet this has an interesting history.
( no connection to the seller)

SEE:-
https://www.jogeier.com/leitz-leica-m39-summitar-2-5cm-no-585762-japanese-embassy.html

 

[Policar]

It may be that the coating started a bit earlier, or that some lenses were recoated during the war years. I have Summitar 526607, which conventional wisdom places as 1939 production, and it has a strange light blue coating rather than the darker purple coating I have seen on later lenses. The lens has the older F-stop sequence, and a distance scale calibrated in feet. Would this have been coated after the war, but with a different material than usual?

Cheers,
Dez

It's many years later, but did you ever figure out the origins of this lens?

I have a very similar lens except with meter "mtr" markings with serial 528863 if I remember correctly. The f stop sequence is 2, 2.2, 3.2, etc.

The coatings appear to be very light blue.

Surprisingly there is no haze but faint "cleaning marks" it seems. I'm afraid to clean the front element.