Explanation regarding the crossover between the seriels P 44501, P 45511 & P 44511 M.
The material is taken from the club directory of the Swedish Volvo PV Club.

Seriel P 44501, started in June 1957, was named P 44511 after 130 produced chassis. The official numbers from Volvo givs October 1958 as start of the seriel P 44511 M but design changes were made already in September.