Is it me or do those valves look a little low in the inserts? Almost "pocketed" as we used to say. Reckon it needs further investigation. Valves can be refaced, but taking away too much material reduces the diameter, so they may be the correct valves, but not true perfection. Same goes for recutting the seats. Bare minimum of material removed to restore back to an unbroken seal.
Odd marks, dots etc are probably of no consequence. Quality valves from times gone always had some makers' mark. BSA stamped the heads with the part number, JAMES and ALPHA marked the stems.
Try ALPHA BEARINGS
http://www.alpha-bearings.com/Valve%20cat/valvehp.htm for a replacement valve catalogue,
Drags also have a valve chart with stem, head, length, OE part number. Takes some finding but it's in there somewhere.
Swarfy.
PS When using a valve compressor to dismantle a head, tighten it up until there is some pressure on the valve cap, then give the valve spring compressor fork on the cap a smack. This will break the bond between the valve collets and the valve cap......then all the compressor has to do is compress the spring and if it can't do that it really is crap. Save your energy, let the hammer do the hard work.