MAS Motorcycles

Today in Motorcycle History

MAS Motorcycles


A Brief History of the Marque

MAS (1920-1956)

MAS (Motocicli Alberico Seiling) was founded by Alberico Seiling, a successful motorcycle designer. Early machines had 148cc, 173cc and 244cc ohv and sv engines with pedalling gears and large outside flywheels. Production in the 1930's concentrated on budget priced 248cc, 348cc and 568cc side valves along with a Lusso Turismo model with a 498cc ohv engine. Most late '30's models offered rear suspension and all models had inclined cylinders. There was also a twostroke, the Lapetta, according to Henshaw.

During WWII, MAS supplied the Italian forces with 498cc ohv singles and a 173cc two stroke. An innovative 122cc single, the Stella Alpina, was introduced in the late '40's. It had a top end cast in the form of two concentric cylinders with an inner cylinder joined to an outer cylinder by a series of vertical fins. The theory behind it was that such a configuration would keep the engine cool at low speeds. It was not a commercial success.

More conventional models in the 50's had 173cc ohv and ohc engines, and an interesting 500cc ohc twin intended for racing never left the prototype stage. Before the company folded, MAS was reduced to making utilitarian 124cc two strokes and a Sachs engined 49cc mini-scooter. This venerable Milanese company closed its doors in 1956.

Hope this is useful ...
Bill Hooben
October 2, 2003
(With minor edits 2016)

Additional notes:

There was also a Seiling brand of motorcycle and another financed by engine manufacturer T├╝rkheimer, the Altea.

Sources: Bill Hooben, Wikipedia, correspondence, Henshaw

More on MAS history, including the Harlette

Fri Apr 28 2017
stefano at
What kind of MAS is this?
MAS Unknown
Hi, my father had a MAS back in Italy, I think it may have been a '55 or '56 not sure, but here is a picture of him with the bike, perhaps some astute person might be able to tell me what it is from this angle, I know it may be difficult but you never know.
Montreal, Canada

MAS-1955c-Italy-Stefano.jpg has been posted in the MAS gallery

Thu Aug 11 2016
mathiasrauscher at

Mas 175ccm<
Hello, I have a MAS milano 175cc , I think it's a MAS Harlette !? I have not got papers for it and no data flat. I would like to typify in Austria and drive on the road . only I need because, unfortunately, a data flat. the frame number would be 3967 , engine number : 20354 and the gear number : R 38437th they can me there might help and tell me as much as possible about the motorcycle ?? I would also know which was light- conditioning factory fitted . Many thanks again and I hope I'll hear from you what . yours sincerely, Mathias Rauscher

Fri Dec 20 2013
MAS motorcycle
MAS 175cc Harlette
I am interested in any information regarding this bike.

This is a very interesting machine built for Harley-Davidson.

Tue May 19 2009
renato at
Moto M.A.S.
M.A.S. 127
I am restoring a MAS 127 with 350cc SV engine, year 1934.
Detailed info here :

P.S.: MAS stands for "Motocicli Alberico Seiling", not for "Motoscafo Anti Sommergibile" [as previously used in the historical article above]

Tue Apr 07 2009
mauc23 at
MAS motorcycle
MAS 1937 570 ?
can you help me to find the model and ,if you have, some documentation (photos, tecnical data , etc.. )of this motorcycle?
The soldier in the photos is my father in Ethiopia, year 1937, during the Italian -Ethiopian war.
Thank you very much,

Wed Mar 04 2009
ben.wieringa at
MAS Stella Alpina
I am the owner of a MAS Stella Alpina of the first series, build in 1949.
send some pictures with this
Schildwolde Netherlands

September 25, 2003
MAS MOTORCYCLES WANTED: I am seeking a 1930's 250, 350, 500 or 600cc sv or ohv single in good condition. Bill Hooben whh at post dot com

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