Possibly a Hammer Brand, an Imperial, or ?.....
Not too recently, this pocket knife arrived in a group or lot of pocket knives that I bought. It now becomes my first example to be posted under this topic or thread. I did NOT buy the group or lot of pocket knives to get this particular pocket knife. But, it did get added to my general, pocket knife accumulation. It is an UNBRANDED, one blade, 3 7/8" closed, a long blade pull, pocket knife. There is absolutely NO country of origin, or ANY other stamp(s) or marking(s) remaining, anywhere on this pocket knife. The main blade does have a WEAK half stop. The main blade does have a GOOD opening snap. The main blade does have a GOOD closing snap. Overall, this pocket knife is in VERY GOOD condition. This pocket knife did NOT need any cleaning at all. I just wiped it off. I took some pictures and here it is.
Caption(s), if any, are on the BOTTOM of the corresponding picture(s).
Click on a picture to ENLARGE.
***** EDIT *****
Per Dimitri (Miller Bro's), this pocket knife is an Imperial.