so the scheme is: rectangular box is just a rectangular box, and the "M" in triangle simply signifies a Migro-groove, only later the triangle with "M" was transfered to the label where the rectangle was, unless it was (later) stereo when the two interlocking circles symbol would indicate as much... but if it was mono, it just had the triangle, but that still only signified microgroove.
So the only time a symbol indicates mono or stereo is when it is stereo?
(Naturally, if the record has the triangle, and not the circles, it will be mono, but that's not what the triangle signifies... just the absence of stereo)
No,no,no, it's not the M of Mono (in 1954 you didn't have Stereophonic records!) , it means Microgroove. I have make the same mistake until 1970, when stereo singles have also the M45 triangle, came usual. Then I knew it didn't mean mono, but I didn't either know what it well meant.
In the fifties you had also a Normal groove, for the 78rpm records.
Some recordplayers had a flip/turn-over pick-up element, one for the M and the other for the N records.
p.s. Mono text on records came in the stereo era, after 1958.
Well this has solved one mystery for me (most classical fans already knew this)....
... The manufacturers credit of Heliodor Records Limited on this, and another DG album I got yesterday show the association of these two companies, that had strongly suggested itself to me having bought a couple of actual Heliodor label albums...
(My searches online by title and cat# seemed to produce DG results, or very near as regards artist and work, leading me to believe that Heliodor was a budget outlet label for older DG stuff)
...And so now it seems that they simply made DG's albums for them here in UK, until they became a label in their own right sometime around the seventies - albeit putting out DG stuff (Likely archive material) -
The deadwax on the A-side of this has was appears to be a date stamp of: "25. 2. 54", so I went with the year as a closest likely approximation of the issue date, but didn't do month or day, as I couldn't be sure that was simply this copy's pressing date (as opposed to title issue date).
I think the reason I'd missed the Heliodor connection is that I'd always gone for the large tulip rimmed label German pressings, that it seems are favoured by classical fans when it comes to DG, and I've always therefore previously passed over "Made In England" DGs...
...However, these two I got were so early I decided to get them anyway, and I have to say the vinyl quality on them both is astonishing... these are very thick, and very stiff, and the other one in particular is heavy vinyl (They are both almost like 78s)... they do rival Columbia quality of the period in this respect.
The labels are a deeper Yellow than later DGs, rough textured, and the "mono box" on this is rectangular, not he later triangular.