I apologize, but where is the record?
It's a very nice foxtrot!

издавался и на Ленмузтресте.

In this case number "1937" on the mass is nothing else but the issue year of the record.
(translated from Russian)

Огромное спасибо, давно хотел его послушать, кстати, какой-то странный "SovSong"!

Действительно, мне тоже редко встречаются диски с такой этикеткой...

Andrei has kindly added the audio
http://www.russian-records.com/details.php?image_id=8362

Since there is no dedicated field for the issue date (it is unknown in the most cases) I moved "1937" to the "xRef Nos" field

I checked another record of this make and it just has the matrix numbers in the mirror, no number that is the same on both sides. So it makes sense that 1937 can be the year.

"ЛЭФ" used to engrave it on its records of the pre-war times.
But it's the year of issue (not record), and there's no siutable line to place it in, so Yuri moved it to "Additional Numbers".

Исправьте, пож., матричный номер. Надо не 530, а 539.
530-й это совсем другая запись.