I'm guessing this gun was manufactured prior to serial numbers being required by law and at some point afterward was turned in for repair work and was given this number so that it could be taken in an repaired. a batch number used for inventory control within the factory. a model number (is it perhaps 5000 or 5100?). a part number a serial number (unlikely on a Riverside gun). or even an ID assigned by a previous owner.
You find it as a 17 digit number stamped into the frame on the left lower frame rail.
Probably 73.
36
1.11 ============================= .111 is lower yet, but neither one meets the usual definition of 3-digit number. By the usual definition, 100 is the smallest 3-digit or 3 figure number.
36
Serial number is stamped on the lower tang of the receiver. It is covered by the lever. Move the lever to see it.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the tens place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
Most F&Ws that HAD a serial number had it stamped on the butt- and stamped on the rear of the cylinder. LEGALLY, the one on the butt is the serial number. Many older guns did not have serial numbers, especially lower cost guns.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the ones place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the hundredths place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the tenths place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the tens place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.