What Rotor is this x 2

[lakeview]

Going through a box of parts, I see 2 non XS rotors.

The drilled 11 inch one has 2A stamped on it and on the obverse has JAPAN; 4 MM; MIN.TH; 1V1

The plain 11 3/4 inch one has a number 34101, the tuning forks with a 2 beside and is 7 mm thick.

Nothing much really turns on this, just a bit of a holiday head scratcher.

 

[CalsXS2]

I don't know about the holey one. But the other appears to be a early stock Yamaha. 74-77?? Unsure of the last year.

Here's some pics of mine I just took for you. It's missing most of the bolts. But they are the same as yours.

 

[XSLeo]

I can't say for sure but the holey one having 4 mount holes probably came off a smaller bike. A 250-400 cc.
Leo

 

[lakeview]

I was looking at the arched cut outs on the larger one and comparing it to my '76, those arches are a different shape, larger, thanks Calxs for pointing the direction.