About this objectA brushed aluminium X-Ray plate (upper). Back has a lever mechanism which when lifted allows the hinged grey, powder coated, metal back to be opened to remove/replace images.
The letters 'S.I' are printed in 'white out fluid'.
Back has a small flexible, light metal plate riveted in middle of top of back plate.
In middle of the back is a blue and white adhesive label:
'Du Pont' Reg. US. Pat. Off
CRONEX R. Hi-Speed - handwritten '1'
Mounted '1/2/67' handwritten - Warranty information.
Supplied by 'WATSON - VICTOR LTD, AUSTRALIA, WATVIC. NZ.