Need Olds help

This belongs to a friend of mine some people say its not that old. Title says 1898 pic has 1899 wrote on the car this is a actual pic of the car from 1921.

serial number is 50691.

Straight dash was offered 1906 and 1907, wheel type and rear axle braces confirm late 1 cylinder production. It is missing its fenders.

I there any way to find out exactly what this is by the serial number 50691 that is stamped on the engine?

I just added up the production numbers of the cars built between 1900 and 1907 and it comes to 13021, so the number on the engine most likely includes the stationary engines (hit and miss style and others) made in the engine shop. If the tag says Job number xxxxxx then that was just the engine number and nothing more. Supposedly the records and remaining casting patterns from the Olds Gas engine works and Seager/ Olds engine works and then Reliance Engineering which was bought by Melling Forge in Lansing were stored in a warehouse in Detroit that burned to the ground in the 50s. I heard that from a 97 year old Employee at Melling who started working there when they were still selling replacement parts for those old engines.It was his first and only job in his life and never took a sick day. Nice guy who I am sure has passed by now. Real neat picture! Looks like it was taken in front of an Olds dealership. I will agree on the 1906-7 date for the car and also add the wheels are the late style also.

"The Serial Number Book" indicates that it is a Model B with model year 1905-1906.