Heard of E & W Leathem of Belfast

Does anyone have any information on E & W Leathem of Belfast? I have what appears to be a 1-key piccolo with E & W Leathem followed by Belfast below the name. I haven’t even been able to find any info about 1-key piccolos. It appears to be well made and is made of African blackwood or cocus (that has oxidized).
Thanks for any help.
Cheers:)

Leathem is mentioned in Gary Hasting’s book ‘With fife and drum’ as a ‘commercial band flute manufacturer’

Thanks for the info, I will try to find the book and check the references.
Cheers:)