What lens is this

[Sushobhon]

Did old Heater lenses lack etching? I don't see any on that one.

Yes this lens don't have any etching. I think very old heater lenses don't have any etching.

 

[NoFair]

They do not look like new positive red.

Like others have said; +Red varies a bit, older ones are usually less yellow and more red/blue. You can still get beautiful newer +Red

 

[WavecloudCustoms]

Poz Red Heater