I think the mirror matrix number should be Ho137ab.

I have never seen records with the Ho at the end as Kelly lists it, they seem to be very early in the series. By 1913 the Ho is at the start, and no doubt stampers made slightly later used this form also for the early ones.

I've heard it said that the letters HO stood for Head Office, i.e. the factory at Hayes, not the central City Road offices which was making more recordings then. But I think that is probably wrong.

Спасибо, Адриан!
Андрей, не могли бы Вы ещё раз перепроверить матричный номер?

Адриан прав, всё таки номер - Ho137ab.

Тогда оркестр должен назваться Silver Shields Band (если верить каталогу Келли).