Good question. I was under the assumption that ALL LEADS were marked on the receiver legs. How would I tell? The barrel is dated 3-52. I do like the lead dipped heels on this 1.0 mil. receiver though!
Edit: I did some more research and it looks like it is a LEAD rebuild. It has the correct parkerizing that is supposedly correct for a LEAD. The barrel is great with a muzzle reading of 0 and a throat reading of 2.
Yep, the very light gray park is indicative - though not with 100% certainty - of a LEAD rebuild. The one I had came in a stock with the LEAD triangle mark, but no inscription on the receiver leg. It was in excellent condition, but I sold it because I'm partial to the early post-war rebuilds. Those often were reparked over the existing finish, so sometimes over the years the finish acquired a hint of plum coloration. I have such a rebuild, and the purplish tint is way cool IMHO.