Original Eley Wasps stopped being made approx 10 years back. Since then similar looking pellets in similar looking tins have been made by a different company (Bisley I believe), and are marketed as simply 'Wasps'.

Because any tins still badged Eley harp back to a by-gone era (1960s, 1970s and 1980s), there is a level of demand for tins such as yours among collectors, but in essence, imo, they have no greater value than the new tins as mentioned by flogger above? Hope this (sort of) helps?