I have a Waltham Riverside 19 jewel movement in a gold filled (20 years) hunter case. The movement serial number (15000566) dates it to 1906/7.
The case serial number (on case back, dust cover and body) is 6002767 and on the inside of the case back 'Warranted B&B Royal 20 Years'. So far my 'googling' for date information has been in vain.
Can anybody assist, please ?