Corps of Army Music T R F

[49lassiepen]

At present construction a'' board '' of C A M US items as hodges book Couple of items short -C A M U S buttons I have them on a cap but not loose
Re the size of the T R F which the corps used to wear
Hodges gives the size as 50x 62.5 mm in his book published in 2005
Marc J Sherriff gives the size as 58x 73mm in his book published in 2007 vol !11 This is similar sizes that I have in my collection
My question did the size alter between these dates ?? when ?? or are these just manufacture /makers variation
David