This has probably been asked a thousand times but I can't seem to find a good source or link. I am working with a UK made Gillette NEW LC with a patent pending # of 133969. Is there a way to date this razor ? I know in theory it could form the 1930's-40 but there is no pat pend Jan. 1920 etc. like the US models have just a pat pending 133969. Thanks for any input !!! - Aaron