I have a similar mystery pipe, it's nearly identical to a Stanwell 63M, but not quite. Look at the stamp very closely and compare it to others, I have seen Stanwells with only the "made in..." stamp, so your pipe could very well be a Stanny...
...from the stamp on my pipe, I've decided it's either a Kriswill or a Karl Erik made pipe, it took a while to come to this conclusion and I don't think I'll ever know for sure, but it's a decent $12 pipe for sure!