It's possible that it could be the Model 201 which has the Paperclip Decal Pattern.
There is a lesser possibility that it could be the Model 191 or 206 but they can be identified at the same location and only one design was used on these machines.
Singer didn't put the model numbers on their domestic machines before the early 1950's, hence the need for this chart.
The number stamped on the bed of the machine is the serial number; both letters and numbers.
Luckily, a quick search online yielded several resources that helped me narrow down my Singer's model number.
The best and easiest to navigate is Sandman Collectibles' online Singer identification guide.
THIS INFORMATION SHOULD NOT BE USED TO DERTIMINE SEWING MACHINE VALUE.
1-100 101-900 901-1711 1712-2521 2522-3400 3401-4283 4284-6847 6848-10477 10478-14071 14072-25024 25025-43000 43001-61000 61001-79396 79397-99426 99,427-123,058 123,059-149,399 149,400-180,360 180,361-223,414 223,415-283,044 283,045-369,826 369,827-497,660 497,661-913,999 914,000-963,999 964,000-1,349,999 1,350,000-1,914,999 1,915,000-2,034,999 2,350,000-2,154,999 2,155,000-2,764,999 2,765,000-2,924,999 2,925,000-3,679,999 3,680,000-3,939,999 3,940,000-4,889,999 4,890,000-5,483,999 5,494,000-6,004,999 6,005,000-6,524,999 6,525,000-7,046,499 7,046,500-7,471,599 7,471,600-7,918,999 7,919,000-8,615,499 8,615,500-9,436,999 9,437,000-9,809,999 9,810,000-10,629,9909 10,630,000-11,338,999 11,339,000-11,913,499 11,913,500-12,745,499 12,475,500-13,387,999 13,388,000-14,047,999 14,048,000-14,919,999 14,920,000-15,811,499 15,811,500-16,831,099 During WWII some Singer manuafacturing records were lost.
Several years ago, I was given an antique Singer treadle sewing machine that has been passed down through my family for a few generations.
I had no idea when it was manufactured or its model number.
After 1900, the machine serial numbers have a single or two-letter prefix.
The tables are divided into these three categories: A - Podolsk, Russia B - Elizabeth, New Jersey USA C - Wittenberge, (Prussia) Germany D - Elizabeth, New Jersey USA E - Podolsk, Russia F - Clydebank, Scotland G - Elizabeth, New Jersey USA H - Elizabeth, New Jersey USA J - Clydebank, Scotland K - Elizabeth, New Jersey USA L - Elizabeth, New Jersey USA M - Clydebank, Scotland N - Elizabeth, New Jersey USA P - Clydebank, Scotland R - Clydebank, Scotland S - Clydebank, Scotland S*- Podolsk, Russia (*100 "S" machines made in Podolsk) T - Podolsk, Russia V - Clydebank, Scotland W - Bridgeport, Connecticut USA X - Clydebank, Scotland Y - Clydebank, Scotland AA to AT - Elizabeth, New Jersey USA BA to BY - Elizabeth, New Jersey USA CA to CY - Bogota, Colombia DA to DY - Karachi, Pakistan EA to EY - Clydebank, Scotland FA to FY - Clydebank, Scotland GA to GY - Clydebank, Scotland HA to HY - Istanbul, Turkey JA to JE - St.
You can try visiting your nearest BERNINA store to find out if they can help, you might get lucky and find an authorized BERNINA Technician that's been around forever and knows all about the older models.