Fixed links are often machine-pressed w/ splined pins. Not designed for easy removal, however they can be removed by disassembly using basic tools and some force.
Disclaimer: while I would encourage you to use this as a learning opportunity if this is an inexpensive homage piece (that band looks like the one used on a number of older model Invicta submariner styles, for example) if it’s expensive or an heirloom, you might instead replace the band to keep the original intact. A lot of watch nerds do that anyway because the variety is fun.