Enter your description with html/xhtml formatting. You can separate the lines in your example by using the break tag (<br />). It might look something like this:
Make: Sealand Model:<br /> N/A Year of Manufacture: Around 1920 Case: 18ct solid yellow gold<br /> Movement: Manual Wind mechanical movement<br /> Chain: Individually stamped in solid 18ct yellow gold<br /> Condition: Mint Serial<br /> Number: N/A Value: N/A<br />