This advert from a 1963 British music magazine highlights two new Watkins amplifiers: the 14w 'piggy back' Pick-a-Back, head with 12" Pick-a-Bass cabinet, and the Scout combo, also 14w, but fitted with a 10" speaker.
These two WEM amps were widely promoted in the early/mid 1960s. Neither lasted too long though. The Pick-a-back evolved into the (very similar) ER-15 by 1964, whilst the Scout was replaced by the Custom 15.
$489
$450
$200
£42
£400
£800
£800
€360
£400
£365
£750
£500
£650
£125
£300
€1294
£525
€1250
£7699