I cannot see any slot on the side.
These are the numbers I can find on the chassis:-
582062
Part number 579629
Series 19 550SP
Motor. 190
2850
Self Propelled 573298
If any of this helps.
These are the numbers I can find on the chassis:-
582062
Part number 579629
Series 19 550SP
Motor. 190
2850
Self Propelled 573298
If any of this helps.