Vintage Greeting card - gold key on purple 21st Party invitations -original 1970s pack of eight

A pack of eight 21st  birthday party invitations, original small sized vintage 1970s greeting card made by Sands.

On the cover:

A 21st Birthday Invitation 
Golden key on a purple card

On the inside:

To...
You are invited by...
to the 21st Birthday of...
at...
on...at...o'clock
R.S.V.P

Card measures 8cm x 12.5cm. 

Envelopes included.