A Siren is a mermaid who, according to the legend, protects the river Vistula and the Polish capital city, Warsaw.

But due to a lack of deep-drawn metal parts and cost reductions, the first Syrena 100 cars were supposed to have a wooden bodywork covered with leather-like material.

They met halfway by combining the first car's design with the steel bodywork of the second one (with one exception – the roof remained wooden).

One of the cars, driven by Karol Pionnier, crashed, revealing the weak structure of the roof.

Syrena 100 was designed by engineers Stanislaw Lukasiewicz, Stanisław Panczakiewicz and Fryderyk Bluemke.

Because of financial reasons, Syrena 100 and the much larger Warszawa automobile shared many parts.

The "Lux" version, produced from 1974, had the gear lever and handbrake between the front seats.

A 1983 FSM Syrena 105L finished in yellow was featured in series 10 episode 10 of the British television program Wheeler Dealers.

Presenter Mike Brewer purchased the car in Poland for zł7,000 (the equivalent of £1,400) and drove it back to the show's UK-based workshop where it underwent repairs and upgrades by mechanic Edd China.

The completed car was driven to the Polish embassy where ambassador Witold Sobków took a ride with them.

The first model of the Bosto was revealed in December 1971, at the newly constructed FSM factory in Bielsko-Biala in southern Poland.

The driver's compartment was separated from the rear load space by a single sheet bulkhead, and additional roof-fixed netting.

Because the Bosto was designed for heavy loads, as opposed to the sedan version of the Syrena, the suspension underneath was modified.