I'm sorry but I have no idea if that record set is "collectible". It certainly is interesting and it has good music on it. My guess is that it is from before 1925 since I think the speeds got closer to 78 RPM with electrical recording. I think the lack of a lead-in groove and run-out groove was pretty much standard for early records.
The fact that they state the speed suggests to me that it is fairly accurate. Now the question is: Is this record vertically cut as an Edison Diamond disc or lateral cut. Edison Diamond discs were vertical cut.
Since this set looks pristine I would suggest that you find out more about it before attempting to play it. This is especially important if you are putting on an old acoustic machine. If you play it with a ~3 mill stylus in a stereo cartridge you will likely not do any damage to it. If you play it on a stereo system and the sound seems to come from between the speakers it is lateral cut like Lps and most 78s. If the sound has no apparent direction it is vertical cut like an Edison.
How thick are the discs? Edisons are about 1/4". Can you post pictures of them?
I would love to put them on my turntable and give them a listen. My machine will spin at 80 RPM as well as 78.26, 45, and 33 1/3 RPM. I can also play both vertical and lateral records properly in mono.
wapper wrote:I recently unearthed a two record set by "The English String Quartet" put out on Columbia's label (London). The records appear to have never been played, they are in an unmarked condition. The speed is 80 on the label and not 78. The recording is of Haydn's Opus64 in 4 parts. The records have no lead in groove and the needle finish groove doesn't go to the label. My question is are these records as scarce as I believe and are they worth anything to collectors?