M&H RACEMASTER slick decoding needed!!

[Verne_Frantz]

I need help decoding a pair of NOS M&H cheater slicks I have. Each tire has an old brown shipping label which says M&H RACEMASTER WARETOWN, MASS on it. They were shipped to California Speed & Sport Shop, Jersey Ave. New Brunswick, NJ. These tires have two segmented circumficial grooves in the slick surface and two very fine raised circumficial ridges on each side about 1/2" below the meat of the slick. (sorry, if I had a camera, I could post pictures)

Each tire has the following raised lettering: 7.0/30.5-15, NOT FOR HIGHWAY USE. Each also has an indented mold mark (between the typical 2 screw holes) with raised numbers 130. ( I believe this may be the compound #) Each tire also has yellow crayon writing on the contact surface that says,
7.0
30.5
130

One tire has a raised R-7 and one has F-7. One tire also has a mold plate (with the typical screw heads) with J491706. The other has J491805.

I'm always amazed at how Rick can decode OEM tires, but I was hoping someone could decode these M&Hs for me. The raised large letter M&H RACEMASTER logo is in outlined letters, but with no white ink anywhere. One tire has a white ink stamp about the size of a postage stamp with 2 characters in it, but I can't make them out (maybe a letter and a number?)

I mainly would like to know what date these tires are. And any other info would be greatly appreciated. (or any leads where I can find it)

Thanks guys!

Verne