First off, it isn't a 98 clone.
Secondly, it has the small cut out at the top of the receiver ring to accept the Spitzer type bullets of the 8x57. The bayo in the pic is a 1908 Brazilian and is worth more than the 410 by itself.
This isn't the first 1904/39 I've seen without front sight protectors.
If you're lucky, it still has its original trigger guard/ floor plate. Many of them were stripped off for sporter builds on 98 actions They fit perfectly and have latched, swinging floor plates.
As for the bolt, they are very easy to take apart and have to be assembled properly. Rumor has it the Portuguese troops weren't allowed to disassemble the bolts during cleaning as they have to be properly indexed when reassembled. Google the bolt by name and you will find easy to follow instructions on reassembly.
The two I have are both slightly different from each other. I think it all depended on what parts were available when they were converted to 8x57.
One has the stepped profile barrel similar to that on a K98 and the other has a slimmer straight profile barrel. Both appear to be correct.
As far as value goes. Condition is everything. I recently sold one in excellent condition for $$450. Your rifle isn't in excellent condition.
As far as you only wanting a 98 that is your personal preference.
IMHO, the rifle you have is every bit as good. It is smoother operating than a 98 and if the bore is in excellent condition as most of these seem to be, it is every bit as accurate and even though it is sacrilege to say so, maybe even more accurate than a 98. The sighting system is almost identical and the sight protectors actually work well as low light sights at short range in stressful conditions.
One thing I really do not understand, is why these rifles don't get more respect than they do. They are covered in history. They were issued in Portugal as well as every corner of their empire. A very easily carried and brought into action rifle as well as being extremely reliable.
Some sneer at the split bridge. Don't ask me why because I certainly don't know the answer. For the rifle's intended purpose the split bridge poses no issues for the troops using it.
It's a good rifle that is steeped in history all over the world. Use it and enjoy it. There are no flies on its design or effectiveness. I have shot several white tails with mine from 20-200 yards.