Meccano Clockwork Motors, Nickel period Post WW1 Made in England. 7 models all with small variations starting top left to right. type 1: large text, 6 bolts, hole, so;id gear wheel type 2: large text, 6 bolts, no hole, open gear wheel type 3: large tekst, 4 bolts, hole holds pin type 4: small tekst, 5 bolts, Meccano Ltd, Liverpool Eng, 2 arrows, made in England, Pat 21117/12, meccano, fabrique en angleterre. type 5: small tekst, 5 bolts, Meccano Ltd, Liverpool Eng, 2 arrows, made in England, Pat 21117/12, fabrique en angleterre. type 6: small tekst, 4 bolts, Meccano Ltd, Liverpool Eng, 2 arrows, made in England. Type 7: small tekst, 4 bolts, Meccano Ltd, Liverpool Eng, no arrows, made in England. Who can help to date the various models.