(Source: Cannon, W.A., & Fox, F.K.,Stubaker the complete story. Tab Books Inc. Blue Ridge Summit, PA )

THE ERSKINE: 1027-7930----------------------------------------
Specifications
Model Model     displ   wb.
Year  No.   hp. cu.in.  in.    Sedal Numbers      Engine Numbers
1927  50    40  146.1   107  5,000,000-5,025,000   BF-1 to 30,850
1928  51    43  160.4   107  5,025,00l-5,047,400   9F-100,O01 to
1929  52    43  160.4   109  5,047,401-5,073,000   139,900**
1930* 53    70  205.3   114  5,073,001-5,096,000   E-OO1 up
*By May, 1930 the Erskine name was no longer used and the model 53
became 
the Studebaker Six.
**Engine Numbers 9F-100,001-139,900 in both 1928 & 1929 models.
Cars manufactured in Canada:  Model 50:   5,950,001 to 5,950,250
                              Model 52:   5,950,251 to 5,951,410
                              Model 53:   5,951,500 to 5,952,200
The serial number is on the front of the dash prior to car serial
number 
5,001,495. After this serial the number will be located on a plate
attached
to the left frame member under the front fender.
The body number and symbol is located on the lower left corner of
the dash 
on the engine side.
The engine number is stamped on an aluminum plate attached to the
left rear 
side of the engine on models 50, 51 and 52. On model 53 cars the
engine 
number is stamped on a boss located just above the water jacket
cover plate.
                    ERSKINE SIX BODY TYPES
Body Type                       Symbol     Model
Custom Sedan - wood wheels        W       50,51,52
Royal Sedan - wood wheels         W       51
Royal Sedan - wire wheels         W       52
Regular Sedan - Mohair trim       W2      53
Regal Sedan - Mohair trim         W2      53
Regular Sedan - Cloth trim        W3      53
Regal Sedan - Cloth trim          W4      53
Landau Sedan                      U       53  
Club Sedan                        F       51,52,53
Business Coupe                    Q       50
Business Coupe                    Ql      53
Custom Coupe - rumble seat        E       50
Regal Coupe - Mohair trim, 
rumble seat                       Q3      53
Regal Coupe - Cloth trim, 
rumble seat                       Q5      53
Sport Cabriolet - wood wheels     E       51,52
Sport Cabriolet - wire wheels     E       52
Club Sedan                        F       51,52
Tourer - wood wheels              T       50,51
Regular - Tourer                  T1      53
Regal - Tourer                    T2      53
Sport - Roadster                  J       50,51
Roadster                          R1      53
Screen And Panel Deliverv         B       51,52