I did some research on this a few years ago.
As a result, I made this overview showing different models in relation to the age of the bike.
I have named them model 1 to 4 respectively.

- Gazelle transfers.jpg (49.31 KiB) 5048 keer bekeken
Know that there is defenitely some mistery left here, as some bikes does not match with this view.
As for your drawing, I would say that your transfer model matches the age of your bike, which is 1957.
However, the "Nr1" is not the same 'Font' as found on the original. That would need some modification, if you want to make it more authentic.
I also notice some sharpenings here and there, that make it look like 'fake'.
Here is a picture of how the transfer would look like (although it is a 1957 Nr8 instead of a Nr1).
Unfortunately I did not find a decent looking Nr1 of that age in my database.

- 1957 Nr8.JPG (34.86 KiB) 5048 keer bekeken
Also notice that these transfers are Clear, not Black.
I have added one of a green bike to show this.
They usualy become black by adding it on a black tube.
Last year, 'fietser' brought the following contrary transfer to my attention. This model has a golden background with black (or clear) lettering.

- Model 2 black.jpg (15.98 KiB) 5048 keer bekeken
Please keep us posted on your progress.
Regards,
Ed.