definition of the year [解決]

Hello, please give an approximate date of this token

My guess approx. 1900 +/- 50 years.

 Yes. This page says it (and similar token with 6 on) 

was made (presumably in UK) by the Ruffler & Walker company. 

https://www.ebay.co.uk/itm/135587112208 

[Diameter: 18mm / Weight: 2.68g] 

 This other token - same outer design but with a 6 - 

has R&W on the other side. 

https://www.ebay.co.uk/itm/353005881077 

 Also - https://penny-arcade.info/the-ruffler-walker-collection 

which shows a lot of the machines they were used on, 

and gives 1934 to 1969 dates for the company - in Clapham, Greater London. 

 Also - https://pennymachines.co.uk/museum/ruffler-and-walker/