Can anyone tell me about this mold. What do the markings mean?

Eagan was the go-to guy for moulds for the Cast Bullet Association benchrest set until he died a decade or so ago.  All the Eagan moulds I've seen were nose-pour, cherry cut and heavy brass blocks.  I think he kept them large for heat retention.

The MX-3 was a certain design of his illustrated in his catalog.  Mine is followed by a "30", which I presume identifies it as a .30 caliber.  The bullets I've cast from it are indeed .30 caliber.  Yours has a "32" so I would surmise yours will cast a .32 caliber bullet.  Have you done any casting with it?

The other numbers, I believe, are assembly numbers and the date of manufacture.

I've not seen a plain base Eagan design before; most were gas-checked.  The "S" might mean "Scheutzen" or "Special."

frnkeore, where was Eagan located ? was it in pa. ?

Note that it says linotype. Your bullets should be about .001+ under those dimensions.

Frank

Thanks Frank,  Should I hold on to it in case someday I have a .32 rifle or list it for sale?