You do not need to use plurals and remember not to use words unlikely to be used in a lot description (
such as 'furniture' or 'jewellery' ).
results searching for Fire brigade helmet
SOLD FOR £75
An metal pin cushion in the form of an LCC London Fire Brigade Merryweather helmet marked from Harvey to Neller 998, 1 other (hinge a/f), 3 others in the form of inkwells (1 with split to front, 1 with chip to ceramic inkwell), a gilt metal inkwell in the form of a fireman's helmet, table bell in the form of a Metropolitan Police helmet, English pewter figure of a fireman and child and a Dennis brass wheel hub nut
SOLD FOR £85
An Auxiliary Fire Service Durham County Fire Brigade fireman's helmet, a yellow Ministry of Defence fireman's helmet and 1 other black fireman's helmet marked FB
SOLD FOR £120
A 19th/20th Century brass National Fire Brigade Association Fireman's helmet, some damage, ILLUSTRATED