A magnet will certainly clear up the question about any parts being steel or cast iron .
The sellers' claim that there have been 'no repairs' made might just mean 'repairs made by the seller' , so it would only be a semi-lie (kinda like semi-pregnant?) .
Dissimilar metals often react to each other (such as a steel machine screw & cast iron) over time : if the screw is the original one , the threads would not be shiny , as you've described it to be .
The wire and clapper look new also .
It's not unusual to see file marks remain for long periods of time (on 'contact surfaces' of cast iron) , since it's really quite abrasive and will normally wear down a surface it is on (quicker that it gets worn down) , however -
Clear file marking indicate hasty manufacture to me , and are mostly atypical of older craftsmanship .
Also , as others have commented , non-removal of metal 'flash' indicates the same as above .
I'd call the crastsmanship 'Rough and hasty' .
I'll be merciful , and refer to your little bell as a 'fantasy' item .