Have a look for hallmarks on all the silver-coloured items (dirk, badges, brooches, sporran cantle etc.) If they are silver they may have both hallmarks and makers marks. These can be used to identify the date and will give a better idea of value.

Tartan and diced hose usually sell for between £80 and £115 when new (occasionally as low as £40) and for £15 to £40 when used.