There are many other more subtle features that can help identify your stationary engine's
date of manufacture...
The Mamod Minor 1 had a single wick burner until 1970, it then had a very narrow vap type burner until 1976 when it got
a solid fuel burner which was much narrower again than the rest of the range's burner trays.
All engines prior to 1949 did not have any form of 'superheating'. When the engine frames were revamped with pressed
steel, the pipework was modified to loop under the boiler giving a mild superheating effect. All superheating on the SE1/2
was dropped for the 1967 revamped models (SE1a/SE2a). Only the SE3 retained its superheated steam pipe. Some early mazak flywheels
(1953) used the earlier hot brass stamped pattern/casting.
Up until around 1958 all the fireboxes were of the 'open top type'. With the introduction of the vapourising lamps across
the whole Mamod range (except the MM1) the fireboxes were revised with a more enclosed top edge and a wider firebox opening.
In the 1979 redesign of the whole stationary range, the firebox opening was closed with the help of a 'steel plate' modelled
on a real furnace door. This item was part of the solid fuel tray's manufacture.
Forward and reverse controls did not appear on any Mamod stationary until 1967 with the introduction of the SE2a.
(A reverse control had been fitted to the MEC1 in 1965 - although only made by Malins and designed by Meccano).
The steam regulator on the SE2 disappeared in 1967 when it became the SE2a.
In 1969 the only variation of the SE3 was introduced - the Griffin and George version, complete with hard soldered boiler,
no regulator and specific G & G badging. All subsequent 'G&G models' after the initial run of 2,000 models were merely
badged by Griffin and George, this includes later SE3s and the SP4. The original SE3 G&G was only supplied to schools.
Sometime around 1967 and continuing into the early 1970s the 'engine frame green' was sometimes replaced with a metallic
'hammer effect' paint. This reverted back the the 'Ford Highland Green' sometime after that, although this shade seems to
vary from minty green to a darker sage green. I find the sage green being the later shade of paint ie 1970s. In 1979 all the
range was repainted in a red/blue colourway to match the revised tool range.
The revised SP range of engines comprised the SP1, 2, 3, 4 and 5. The low sales and financial difficulties of the company
meant that the SP1 (old MM1), the SP3 (Mamod badged and repainted MEC1) and the twin cylindered SP5 were dropped in 1985.
A new SP5 was introduced in 2002 complete with dynamo, although basically an economy version of the first SP5. Dynamos were
also fitted to the SP2(D) and the rarer SP4(D). The later SP6 with the new piston valve engine was brought in during 2006
- a limited edition version for a steam reseller in the UK had what I believe to be the first Mamod with a green base commercially
During the mid 1960s the SE3 started to have its decal at the end of the firebox (chimney end) - the design was the 'compressed
scalloped edge type' which was also used on the MM1.
Early Mamod tools with mazak flywheels can be recognised by the 'unclipped' wheels ie the rims are left painted red.
Flywheels varied in thickness, although the later 1960s and 1970s versions seem to be thinner. The power press sometimes had
a centre hub goove as well as a rim groove for drive bands - probably inherited from the power hammer. Up until the early/mid
1960s all Mamod tools had lubricating holes for the plain bearings.
Finally Marine engines were reintroduced in 1958 the ME1 and the ME2 (an ME1 with wick burner was available from
1937-40). Both used the new brass vapourisng spirit lamp with an engine block (angled on the ME1) equipped with oil reservoir
(soon dropped). Later MEs used the steel pan type vap lamp and later ones still used the solid fuel tray. The ME1 had a stern
tube and prop, the ME2 had a shorter baseplate, upright engine frame and dogged power take off pulley. It was dropped in 1965,
in favour of the ME3 (using and ME2 baseplate) using an SEL engine - which some would say is better than the Mamod unit. About
2,700 ME3s were made before they were dropped in 1972. The ME1 soldiered on until the early 1980s. Meths, and solid fuel types
are available as are sight glass versions. All are now rare.