Members of the PCS union at museums in Scotland and Wales are fighting separate attacks on weekend pay.
Workers at all National Museum of Wales sites struck last Saturday.
The action was part of rolling strikes that ended on Monday of this week.
Bosses want to scrap premium payments for weekend working.
Meanwhile workers at the National Museum of Scotland are demanding weekend working allowances be paid to all staff.
They completed a seven-day strike last Sunday.
Striker Robert Burns told Socialist Worker, “Management want a race to the bottom because they have a total lack of connection with how people have to live today.”
Thanks to Donny Gluckstein
500 people rallied in London
Another sign of establishment crisis
Support this crucial fight
His treatment exposes the British state