12.7 japanese vickers proof?

I bought this live 12.7 Japanese Vickers from a well known wheeler dealer. All red with green tip and mouth. Original old paint. Any ideas from you lovers of the oriental mysteries?

Anyone ?

Could this be something that a kid has painted like those German 7.9s discussed on here a while ago? Looks like it could have been painted with kids paint that has now mostly worn off. Just a thought.

This is baked on lac. paint.

Rules that one out then.

This is serious paint for a serious ID reason. So far no good answer.