Need some help please with the translation.

[Patrick86]

I recently bought this piece. Can someone perhaps help me with the translation? And can tell me exactly what this is? 
thank you so much in advance 

[ChrisW]

Looks almost like a plug bayonet, but perhaps made with the broken portion of a blade. That "mei" is almost certainly dremel-cut though.

Maybe someone's home project to recycle some steel.

[Nobody]

伊藤店用 - For Ito-shop's use

[ROKUJURO]

4 hours ago, ChrisW said:

......That "mei" is almost certainly dremel-cut though......

Chris,

have you ever seen a DREMEL tool? It is a small rotational tool like a tiny grinder or a dentist's drill.

These KANJI are clearly cut with a sharp chisel, not beautifully I have to admit. 

[Brian]

A tool. Maybe something meant for woodwork or...?
Nice item though.

[Patrick86]

Thank you All for your information. 
It was in a lot with arrow heads. 
So i was also curious what it was. 
 

[eternal_newbie]

I've seen a couple of these before in random online stores, one was listed as a throwing knife blade and the other was listed as a paper craft knife. As to which (if any) of those descriptions were correct, I have no idea...