I agree with your assessment of the model. Congratulations on owning a really nice historic camera. It matches the 1894 information we have in our database for the Kodak No. 2 camera
and the photo we have exactly. 4 1/2 x 5 x 9 - 2 lb. 12 oz., originally priced at $32.50. I agree with your friend that the spirit level is an add on, likely at the time of purchase. Our example picture shows that a handle was added after 1894, so you most likely have a late model c1896. The back should open to expose the roll film cartridge. I own the No. 1
and the back is removed by removing the silver turn key on top ( it is reverse threaded ), then the roll holder would slide out the back, I am not sure if the no. 2 works the same way, but you can try this.