Fox Anyone know what heads these are

I could have sworn my old twisted wedges were numbered just like that.
You can call them, if it's their numbering, they will tell you about them if that's what they are.

edit: I looked for some pics that I took when I called them, but couldn't find them.
Regardless, i'm still thinking they are an older set.

I have an old set of TFS TW 170 heads that look just like that. Hand stamped serial numbers and all. No other markings to indicate brand or size.