One can roughly determine the period of production by noting what transfers were mounted, assuming they are original. If the frame was renovated, it may bear newer transfers. Hetchins production falls into the following periods:
Pre-War Tottenham, from 1934
Post-War Tottenham, until Feb. 1974
Southend-On-Sea, 1974 to April 1986
Modern Period:
Bob Jackson (Leeds), 1986 to 1993
David Miller, 1993 to present

Laurel crest.
Tottenham, 90mm high.

Color bar crest.
Southend, 75mm high.

Laurel crest, Southend.
Two sizes are known:
68 mm high and 53 mm high.

Tottenham laurel crest: [top left], bears the words 'Tottenham, London N15', and features a laurel wreath around the sides. It was often fitted to the seat tube, and a metal badge was usually fitted to the head tube. The center shield consists of four white fields. The upper left one usually has a dagger, but some are known without a dagger. The reason for the difference is not known.

Southend laurel crest & Olympic color bar crest: during 1974 the shop was forced to move due to a planned street widening project in Tottenham. The operation moved to Southend-On-Sea and two different crest transfers were designed. The laurel wreath design was changed to read 'Southend, England' instead of 'Tottenham, London' [above left]. Another crest was designed with Olympic Champion color bars [top right]. The word 'specialists' replaced 'Tottenham' in the center, and 'England' replaced 'London N15'. These, as well as remaining stocks of Tottenham laurel wreath transfers, were fitted to seat tubes; laurel-wreath crests were also often fitted to head tubes in the 1970s when bronze badges became scarce.

The color bar crest is often seen on frames made after the operation moved to Bob Jackson Cycles. However, the color bar crest is also known from the 1950s as the centerpiece of the Coronation seat tube transfer.

All of these crests are still available and any style may be found on new production or renovated frames.

Tottenham,
laurel wreath,
no dagger.

Southend,
color bars,
'Specialists',
after Feb. 1974.

A crest without laurel wreath or color bars is a reproduction, not original.

Scroll crest.
Height: 68mm.

The above crest with a scroll beneath was sometimes used in place of a metal badge on the head tube on both pre- and post-War models. It bears the address in Seven Sisters Road, Tottenham.

Very early ones have the old address 780/2 Seven Sisters Road; 56mm high. In January 1935, the address was changed (due to local house renumbering) to 798 and 800 Seven Sisters Road; 68mm high. Although new scroll-crest transfers were made, transfers with the old address were still being supplied by Alf as late as the mid 1970s (possibly using up old stocks when stocks of the newer transfers were exhausted, or for short frames on which the larger crest would not fit--see foto below).

There are several known variations of scroll crest transfers: 1) 'Hetchins' in block letters or cursive letters; 2) Suppliers or Makers; 3) old address (780/2) or new address (798 & 800).

The same crest with various backgrounds was used on Six-Day seat tube transfers. Left: scroll crest with white background, fitted to head or seat tube. This transfer has been duplicated and is used on new and renovated frames.

1970s frames were sometimes fitted with a Gothic 'H' transfer.

The crest below was introduced after the move to Southend.
It appears to have been used on cycles sold, but not made, by Hetchins.

Last but not least, the crest below was fitted to non-Hetchins frames
which had been 'reconditioned by' Hetchins.