Provided he doesn't already have it, I'm sure Frank can use the serial # for his research.Several months ago I encountered a sporterized Arisaka, 7x57, with a Mexican crest. I posted a thread to find out what it was and several people expressed an interest in it. Saw it again today at a gunshow in Novi, (Michigan).
I got the guys phone number if anybody is interested. PM me or send an email to mattnormanATcomcast.net