Kreigs Marine Holster Value

[maddog350gt]

At the Portland Gun show a well known Luger Collector had an Eagle/M marked holster for sale. I don't recall the maker or the year only that it had the E/M stamp. It was black and made for the 4" Luger, it was in Good to Very Good condition. Asking price was $350, would this be a good buy? What should one look for in assessing Navy marked holsters?

Thanks,
Bob M.