Antique Martello Calculator-info

Hi all,this is an interesting thing and it’s cool that it also has the manual (but it does seem to me that you need a degree in mathematics to work this) I seemingly have all the info that I would need (including the model number and delivery date) but I can’t find exact similar ones on line? Iam obviously missing something? It’s 57cm long and 18cm wide. Thanks for any help

 

@Roaring20s
Can I maybe ask that you do a quick search to see if you can find this make and model,pretty please (but also only if you have the time and you feel like) I only ask because of your ‘great skill- next level’ research abilities. Im really not getting anywhere. Many thanks