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Published: 16 April 2025

Markings on 78 rpm Records

The really important things about most records are their performer, and the title. But in order to keep records in logical order on their stock shelves, manufacturers & dealers also needed numbers and letters and sometimes other signs. 

Last of all, there is the small letter M to be found at 3 o’clock in the wax. This is the stamper number. G – R – A –M… that’s the fourth stamper produced from the mother.
What happened if they made more than 10 stampers? Well, they began again, with two letters. Stamper 11 would be ‘GG’, stamper 12 ‘GR’ and so on. Here is a table covering up to the 110th HMV stamper.

Table of HMV – EMI Stamper letters

 1-1011-2021-3031-4041-5051-6061-7071-8081-9091-100101-110
1GGGRGAGMGOGPGHGLGTGDG
2RGRRRARMRORPRHRLRTRDR
3AGARAAAMAOAPAHALATADA
4MGMRMAMMMOMPMHMLMTMDM
5OGOROAOMOOOPOHOLOTODO
6PGPRPAPMPOPPPHPLPTPDP
7HGHRHAHMHOHPHHHLHTHDH
8LGLRLALMLOLPLHLLLTLDL
9TGTRRATMTOTPTHTLTTTDT
10DGDRDADMDODPDHDLDTDDD

If they needed still more, GGG would be 111, GGR would be 112 & so on. Though I have never seen a three-letter code, there may well be some instances.

It is extremely unusual for a 78 disc to have no numerical identity whatever; so by looking out for odd things ‘in the wax’ and ‘under the label’, then researching them, you will find much of interest. For example, you occasionally see the initials of the recording expert under the label; sometimes famous artistes were asked to autograph the wax. A collection of those would be make a nice theme subject. A few experts, even, had a small monogram seal or stamp they gently impressed in the wax of the master record. If you ever see CO in elongated italics in a Gramophone Co. pressing, that means the disc is derived from a COpy master – a rare example of of ‘reverse electrotyping’ in which, say, a new matrix has been derived from a mother, or a mother from a stamper; quite the opposite of normal procedure.

Good hunting!

Page originally written 2010.
Extensively revised and published here 25th June 2016.

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